RFR: 8378298: Remove obsolete CDS string tests

[Ioi Lam]

On Fri, 20 Feb 2026 17:41:33 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> There are some very basic String test cases that came from early CDS development. They don't serve any purposes anymore as the functionalities are already covered by other test cases.
>> 
>> The methods of `WhiteBox.{areSharedStringsMapped, isSharedInternedString}` do not work for `AOTStreamedHeapLoader`, whose design doesn't distinguish between strings that came from the CDS archive or the app. The test cases that use these methods don't seem to be worth keeping.
>> 
>> `DumpSymbolAndStringTable` should be simplified to only test for `VM.stringtable` and `VM.symboltable`. The boiler-plate tests for `VM.systemdictionary` should be removed as we already have a more elaborate test: `serviceability/dcmd/vm/DictionaryStatsTest.java`.
>
> Good.

Thanks @vnkozlov @matias9927 for the review

-------------

PR Comment: https://git.openjdk.org/jdk/pull/29834#issuecomment-3938007105